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首页> 外文期刊>Geochemistry, geophysics, geosystems >Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography
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Visualizing tephra deposits and sedimentary processes in the marine environment: The potential of X-ray microtomography

机译：可视化海洋环境中的特弗拉沉积物和沉积过程：X射线显微断层摄影术的潜力

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Localized tephra deposition in marine sequences is the product of many complex primary and secondary depositional processes. These can significantly influence the potential applicability of tephra deposits as isochronous marker horizons and current techniques, used in isolation, may be insufficient to fully unravel these processes. Here we demonstrate the innovative application of X-ray microtomography (mu CT) to successfully identify tephra deposits preserved within marine sediments and use these parameters to reconstruct their internal three-dimensional structure. Three-dimensional visualizations and animations of tephra dispersal in the sediment permit a more thorough assessment of postdepositional processes revealing a number of complex microsedimentological features that are not revealed by conventional methods. These features include bioturbation burrows and horizontally discontinuous tephra packages, which have important ramifications for the stratigraphic placement of the isochron in a sedimentary sequence. Our results demonstrate the potential for utilizing rigorous two and three-dimensional microsedimentological analysis of the ichnofabric to enhance and support the use of tephra deposits as isochronous marker horizons and to identify the stratigraphic position that best reflects the primary fallout of ash. The application also provides an exceptional insight into the style and rate of sedimentation processes and permits an assessment of the stratigraphic integrity of a tephra deposit. We discuss the possibility of applying these mu CT methods to the identification of cryptotephras within various paleoclimatic sequences and to enhance our understanding of marine sedimentation processes.
机译：海洋层序中的局部特非拉沉积是许多复杂的初次和二次沉积过程的产物。由于等时标记层和孤立使用的当前技术可能不足以完全解开这些过程，因此这些可能会极大地影响特非拉沉积物的潜在适用性。在这里，我们展示了X射线断层摄影术（mu CT）的创新应用，可以成功地识别出海洋沉积物中保存的提夫拉沉积物，并使用这些参数来重建其内部三维结构。沉积物中特氟拉扩散的三维可视化和动画效果可以对沉积后的过程进行更彻底的评估，从而揭示出许多传统方法无法揭示的复杂的微沉积特征。这些特征包括生物扰动洞穴和水平不连续的特非拉包裹，它们对于等时线在沉积序列中的地层学布置具有重要的影响。我们的结果证明了利用严谨的二维和三维显微沉积学分析沉积物的潜力，以增强和支持将特非拉沉积物用作等时标记层，并确定最能反映灰烬主要沉降的地层位置。该应用程序还提供了对沉积过程的样式和速率的非凡见解，并允许评估特非拉沉积物的地层完整性。我们讨论了将这些mu CT方法应用于各种古气候序列中隐孢子虫鉴定的可能性，并加深了我们对海洋沉积过程的理解。

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